@svta/common-media-library/dist/iso/bmff/parsers/prsl.js

A common library for media playback in JavaScript

/**
 * Parse a PreselectionGroupBox from an IsoView
 *
 * @param view - The IsoView to read data from
 *
 * @returns A parsed PreselectionGroupBox
 *
 * @group ISOBMFF
 *
 * @beta
 */
export function prsl(view) {
    const { version, flags } = view.readFullBox();
    const groupId = view.readUint(4);
    const numEntitiesInGroup = view.readUint(4);
    const entities = view.readEntries(numEntitiesInGroup, () => ({
        entityId: view.readUint(4),
    }));
    const preselectionTag = flags & 0x1000 ? view.readUtf8(-1) : undefined;
    const selectionPriority = flags & 0x2000 ? view.readUint(1) : undefined;
    const interleavingTag = flags & 0x4000 ? view.readUtf8(-1) : undefined;
    return {
        version,
        flags,
        groupId,
        numEntitiesInGroup,
        entities,
        preselectionTag,
        selectionPriority,
        interleavingTag,
    };
}
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